FIELD: radio engineering.
SUBSTANCE: low-frequency band transmission system includes low-frequency generator which is connected at one of electric sub-stations between earthing and middle point of secondary winding of power transformer, control unit, relay protection system, protective commutator, fibre-optic unit and communication line connected to electric transmission line.
EFFECT: enlarging functional capabilities by using electric transmission lines located in acting power system to transmit signals in low-frequency band.
1 dwg
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